WEBINAR ON FUNDAMENTALS OF DIGITAL IMAGE PROCESSING DURING COVID LOCK DOWN by by K.Vijay Anand , Associate Professor, Department of Electronics and Instrumentation Engineering , R.M.K Engineering College, Tamil Nadu , India
2. Main types of digital
image
Colour image (RGB, CMYK)
•An RGB image has 24-bit information (millions of
colours)
•Channels Red, Green and Blue have 256 colours
each.
•For screen images.
•A CMYK image has a 32-bit information
•Channels Cyan, Magenta, Yellow, and Black have
256 colours each.
•For images used in printing offices.
Indexed colour
•8-bit image information. Availability of 256 colours.
•Suits well for coloured drawing graphics, but not
for photographs.
3. Main types of digital image CONT…..
Line-art, bitmap
•An image element consists of 1 bit; 1 = white
and 0 = black.
•Suitable for the presentation of drawings, for
instance, drawing ink works, black and white line
graphics, and texts.
•Requires little saving space due to the lack of
colours, but requires high resolution in order to
show details accurately.
Grayscale image
•The image has 8 bits and 256 tones of grey;
• 1 = black and 255 = white.
•Requires 8 times more saving space than a line-
art image.
•Suitable for presenting black and white
5. Color Image Processing
Green
Color Models:
The Newton Color Circle
CyanYellow
BlueRed
Magenta
•The Newton color circle provides a convenient way to perceive
the additive mixing properties of colors.
•The R,G,B and their complementary colors C,M,Y are placed on
the circle in the order of the wavelengths of the corresponding
spectral colors.